I'm going to make a prediction and say that this kid is flat broke in the next 2-5 years.(if it takes that long) The article seems to gloss over the sickening amounts of variance that poker can have. Just like you can run up from nothing to millions in year, you can go from living in the penthouse to sweeping the lobby over a few bad sessions. Especially at the stakes he's playing at. Ask Mike Matusow about being a pro who's borrowing money to pay bills.
With midrange professional players, I don't think you really see those kinds of crazy swings. Once you reach a certain level, you start doing dumb things, like playing head-to-head games at ridiculous stakes against players you're equally matched with.
Which is why poker doesn't scale well. Eventually you're not going to hit a level where you don't have as clear an advantage over your opponents. Your profits will eventually end up capping out. You either need to find a new angle or start gambling like a degenerate to further advance.
Players like Matusow aren't going to scale down their stakes when their bankroll starts to shrink dramatically.